<script setup lang="js">
import { onMounted } from "vue";
import * as PIXI from 'pixi.js';

onMounted(() => {

    const app = new PIXI.Application({ resizeTo: window });

    document.getElementById('pixi-Tinting-container').appendChild(app.view);

    // holder to store the aliens
    const aliens = [];

    const totalDudes = 20;

    for (let i = 0; i < totalDudes; i++) {
        // create a new Sprite that uses the image name that we just generated as its source
        const dude = PIXI.Sprite.from('https://pixijs.com/assets/eggHead.png');

        // set the anchor point so the texture is centered on the sprite
        dude.anchor.set(0.5);

        // set a random scale for the dude - no point them all being the same size!
        dude.scale.set(0.8 + Math.random() * 0.3);

        // finally lets set the dude to be at a random position..
        dude.x = Math.random() * app.screen.width;
        dude.y = Math.random() * app.screen.height;

        dude.tint = Math.random() * 0xffffff;

        // create some extra properties that will control movement :
        // create a random direction in radians. This is a number between 0 and PI*2 which is the equivalent of 0 - 360 degrees
        dude.direction = Math.random() * Math.PI * 2;

        // this number will be used to modify the direction of the dude over time
        dude.turningSpeed = Math.random() - 0.8;

        // create a random speed for the dude between 2 - 4
        dude.speed = 2 + Math.random() * 2;

        // finally we push the dude into the aliens array so it it can be easily accessed later
        aliens.push(dude);

        app.stage.addChild(dude);
    }

    // create a bounding box for the little dudes
    const dudeBoundsPadding = 100;
    const dudeBounds = new PIXI.Rectangle(
        -dudeBoundsPadding,
        -dudeBoundsPadding,
        app.screen.width + dudeBoundsPadding * 2,
        app.screen.height + dudeBoundsPadding * 2,
    );

    app.ticker.add(() => {
        // iterate through the dudes and update their position
        for (let i = 0; i < aliens.length; i++) {
            const dude = aliens[i];

            dude.direction += dude.turningSpeed * 0.01;
            dude.x += Math.sin(dude.direction) * dude.speed;
            dude.y += Math.cos(dude.direction) * dude.speed;
            dude.rotation = -dude.direction - Math.PI / 2;

            // wrap the dudes by testing their bounds...
            if (dude.x < dudeBounds.x) {
                dude.x += dudeBounds.width;
            }
            else if (dude.x > dudeBounds.x + dudeBounds.width) {
                dude.x -= dudeBounds.width;
            }

            if (dude.y < dudeBounds.y) {
                dude.y += dudeBounds.height;
            }
            else if (dude.y > dudeBounds.y + dudeBounds.height) {
                dude.y -= dudeBounds.height;
            }
        }
    });

})


</script>

<template>
    <div id="pixi-Tinting-container"></div>
</template>

<style scoped></style>
